Blogs / 80beats

Kids suffering from attention deficit hyperactivity disorder (ADHD) may have altered brain chemistry that prevents them from experiencing motivation and rewards like other people, according to a new study published in the Journal of the American Medical Association. Lead researcher Nora Volkow suggests that faulty transmission of the brain chemical dopamine may be to blame for the difficulty people with ADHD experience trying to finish tasks that have no immediate payoff — the difference between doing homework, for instance, and playing a video game [CBC News].

The researchers used PET brain scans to determine how the brains of people with and without ADHD handled the neurotransmitter dopamine, a versatile chemical that is involved in regulating mood, attention, and learning. In particular they measured levels of two proteins – dopamine receptors and transporters – without which dopamine cannot function effectively to influence mood. ADHD patients had lower levels of both proteins in two areas of the brain known as the nucleus accumbens and midbrain. Both form part of the limbic system, responsible for the emotions, and sensations such as motivation and reward [BBC News].

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Kids are bouncing off the walls like never before. Attention deficit hyperactivity disorder (ADHD) has become one of the most commonly diagnosed mental disorders in children, with about 4.4 million cases in the United States. But while medications like Ritalin are very effective in getting these kids to focus on their homework, some parents worry about the effects of long-term use, or have more amorphous concerns about suppressing their children’s personalities. It’s no wonder that more than half of these parents have experimented with alternative medicines and special diets.

Now, however, one of the leading contenders for an effective alternative medicine has been debunked in a new study. Researchers tested St. John’s wort, an herbal supplement that’s been adopted as an alternative treatment for ADHD and which is also used to treat depression. They found that children taking the herb fared no better than those taking a placebo pill.

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